Electric hot-air furnace



April 16, 1929. J. QUERN ELECTRIC HOT AIR FURNACE Filed Feb. 25, 19 28 Patented Apr. 16, 1929.

UNlTEElE Si ar s 1,709,8lltl ELECTRIC HOT-AIR FURNACE.

Application filed. February 25, 19cc. Serial no. asses i.

This invention to electric hot air furnaces and has for its object to provide a construction that will besuitable for private houses, apartments etc, to be used in lieu of coal furnaces or oil burners.

Another object of this inventionis to pro-- vide an electric furnacewhich will be simple, cheap and effective.

A still further object is to provide a construction that can be conveniently transported, and taken apart for cleaning or repair Work. 7

And still a further object is to provide means that will enabl'e the regulation of the temperature within certain limits.

With these and other-objects in view my invention substantially consists in the novel construction, combination and arrangement of parts will be hereinafter more fully described and defined in the appended claims.

In the accompanying drawing which forms part of this specification and in which similar reference characters denote corresponding parts, Fig. 1 is a vertical section of my new electric hot air furnace; Fig. 2 a cross section on line 2-2 of Fig. 1 and Fig. 3 a diagrammatic view of the heating elements and the switch for controlling the same.

In the drawing 10 denotes a substantially circular open base formed with a number of feet 10 to support the same at an elevation from the ground or floor. The base is provided on its upper face with an annular groove 10 Centrally extending through the base and suitably supported is a vertical post 11 on which are mounted in vertically superposed position two horizontally arranged'star shaped or multi-armed members 12, 12. The arms 12 of the two members are in alinement above one another and fixed to each two corresponding arms 12 is a coil resistance 13 suitably insulated from said arms. Fixed to the post 11 below the lower member 12 1s an arm 14. which carries a number of contact points 15 to which all resistances arelconductively connected and which are adapted to be suitably connected to one pole of electric source (not shown) as the house lightmg system. Rotatively supported on the base 10 is a manually operable'arm 16 which has a contact member 16 adapted to be oonductively connected to the other pole of said electric source, andwhich in cooperation with the contact points 15 constitutes a manual switch for regulating the heating unit. Ac cording to the diagram of the present exam ple three resistances 13 are connected in parallel electrically to constitutev a single unit so that by moving the switch onto one of the extreme end contactpoints the circuit will be closed through said three resistances. One or more resistances can be added by turning the switch successively to the'other contact points. 17 denotes a tubular or cylindrical mantle of suitable heat insulating material which preferably is composed of individual separable sections or segments 17 1'? etc. These sections are borne in the annular groove 10 and adapted to engage a similar groove 18 in a lid or cover 18 of similar heat insulatin g material. This lid which is arranged above the heating unit is adapted to close the mantle on top and is provided with one or more air passages 18 vVhen the furnace is to be used for different rooms of an apartment or floors of a private house pipes 19 may be provided to communicate with said. passages to convey the hot air to the different places. the cool air of the room in continuously circulating through the space between the heating elements will be very rapidly heated.

Since various changes may be made in the construction without departing from the principle of my invention, I do not wish to restrict myself to the details; shown and described.

W hat I claim is:

1. An electric .hot air furnace, comprising an open base adapted to be supported at an elevation from the ground, a sectional mantle supported on said base, a lid reinovably borne on top of said mantle and holding the sections together, a plurality of cylindrical electric heating coils vertically supported on said base so as to form a central air space between themselves and means for connecting said electric coils with an electric source, said lid having a number of air passages for the attachment of pipes leading to different places.

2. An electric hot air furnace, comprising an open base having feet and formed with a marginal annular groove, a mantle of heat insulatingmaterial composed of separable sec tions borne in said groove, an electric heating unit comprising two vertically superposed multiarmed members supported on said base and electric coils insulated from one another and extending vertically between correspondin g arms of said two members, stationary conpieces the base connected. to one pole an electric source and to which said are conductively connected, a switch for said electric unit mounted on said base consisting of a manually operable arm having a contact member connected to the other pole of said electric source and adapted to cooperate with said first named contact pieces, and a lid of heat insulating material formed with an annular groove to engage the upper edges of the mantle and closing the top or the latter, said lid having air passages for attachment of hot air pipes leading to different places.

3. An electric hot air furnace comprising an open base having feet, and formed with a marginal annular groove, a mantle of heat insulating material composed of separable sections borne in said. groove, an electric heating unit comprising two vertically superposed imiltiarmed members supported on said base, electric heating; coils insulated from one another and extending vertically between corresponding arms of said two members, and mounted thereon, a lid of heat insulating ma terial formed with an annular groove to engage the upper edges of said mantle and close the top of the latter said lid having air passages for attachment of hot air pipes and means for electrical connection to said heating coils.

In testimony whereof I allix my signature.

JOHN QUEEN. 

